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Stockholders' equity - ASR - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
May 04, 2021
May 27, 2020
Jan. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 03, 2021
Stockholders Equity Note                
Common stock purchases       $ 351,365 [1] $ 681 [2] $ 355,307 [1] $ 503,482 [2]  
Treasury stock                
Stockholders Equity Note                
Common stock purchases       281,365 [1] 154,083 [2] 285,307 [1] 579,818 [2]  
Capital surplus                
Stockholders Equity Note                
Common stock purchases       70,000 [1] (153,402) [2] 70,000 [1] (76,336) [2]  
Accelerate share repurchase                
Stockholders Equity Note                
Stock repurchase program authorized amount     $ 500,000 350,000 $ 500,000 350,000 $ 500,000 $ 350,000
Accelerated share repurchases settlement receipt $ 350,000     $ 350,000   $ 350,000    
Initial shares received as part of an accelerated share repurchase program 3,785,831   7,055,919 3,785,831        
Accelerate share repurchase | Treasury stock                
Stockholders Equity Note                
Common stock purchases $ 280,000   $ 400,000          
Accelerate share repurchase | Capital surplus                
Stockholders Equity Note                
Common stock purchases $ (70,000)   $ (100,000)          
Accelerate share repurchase | COVID-19                
Stockholders Equity Note                
Stock Repurchased During Period Shares           11,819,135    
Accelerated share repurchases price paid per share           $ 42.3043    
Common Shares Repurchased Accelerated Share Repurchase Agreements   4,763,216            
[1] During the quarter ended June 30, 2021, the Corporation entered into a $350 million accelerated share repurchase transaction with respect to its common stock, which was accounted for as a treasury stock transaction. Refer to Note 17 for additional information.
[2] During the quarter ended June 30, 2020, the Corporation completed a $500 million accelerated share repurchase transaction with respect to its common stock, which was accounted for as a treasury stock transaction. Refer to Note 17 for additional information.